[FFmpeg-devel] avcodec/x86/lossless_videodsp : add_left_pred AVX2 v2

[Martin Vignali]

Hello,

New patchs in attach in order to add avx2 version for add_left_pred

Change since the v1 patch
- use ymm constant
- use 3 operandes mode

Check asm result

add_left_pred_rnd_acc_c: 1279.8
add_left_pred_rnd_acc_ssse3: 261.3
add_left_pred_rnd_acc_avx2: 209.8
add_left_pred_zero_c: 1284.8
add_left_pred_zero_ssse3: 260.8
add_left_pred_zero_avx2: 204.8


001 : add return check in the checkasm test
002/003 : add avx2 version

Martin
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